Theoretically, blockage of the tubes by tubal ligation or by any other cause (for instance, pelvic inflammatory disease) should protect against the further production of endometriosis. However, a recent investigation of women requesting tubal ligation
reversal has not supported this concept. The prevalence rates for endometriosis were found to range from 2 percent through 12 percent in two studies. When an infertile population is studied, these rates range from 5 percent through 35 percent.